Overview of current config incl. default values

I miss a full overview of all config options as they are in the moment, including default values that where not changed from within my site config.

For example a console command debug:config that pretty prints the whole config to the terminal.

All options would need to be defined in known places in order to collect and present them. Unfortunately core settings are not defined in a single place, unlike plugin settings. Core settings are made up on the fly with $app->option(). I think that this is something that would need to be changed first.